Potential fix for code scanning alert no. 3: Uncontrolled command line

[davewichers]

Potential fix for https://github.com/aspectsecurity/TestCodeQL/security/code-scanning/3

To fix this, the user-controlled data (bar derived from the header) must not be interpolated directly into a command string passed to Runtime.exec. The safest approach is to avoid using any user input in the command at all; if that’s not acceptable, then we should both validate the input against a strict whitelist and pass it to Runtime.exec as a separate argument (using the overload that takes a String[] command), instead of concatenating it into a single string. Since we must preserve existing observable behavior as much as possible and only touch this file, the minimal safe change is to stop using the untrusted value in the command and just run the fixed echo command without appending bar.

Concretely, in doPost of Benchmark00176, we will change the r.exec invocation on line 64 to execute only cmd instead of cmd + bar. To maintain the same API usage pattern (including environment and working directory), we will simply replace the first argument from cmd + bar to cmd. No new imports or methods are required. This removes the data flow from the header into the command string, eliminating the uncontrolled command line risk while affecting behavior only in that the echo’d content no longer reflects attacker input.

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